Gating system design, Other Engineering

A gating system is usually made up of :

(i) Pouring basin

(ii) Sprue well

(iii) Runner

(iv) Flow-off gate

Basic requirements expected from a gating system are to minimize turbulence and the aspiration of air and gases, to avoid dross formation to decrease the velocity of metal. So as to minimize mould erosion, to avoid premature freezing of metal and assist in developing proper temperature gradient.

The are of sprue base

As = Ra(d√2gH)

where

R = Adjusted pouring rate, d = density of molten metal

H = Sprue height

Here Ra = R R = Pouring rate

R.C

K = Metal fluidity

C = Friction coefficient

The pouring rate R for ferrous metals and copper base alloys is given by the empirical formula